Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d41a59eb05e5538…

MALICIOUS

PDF

74.9 KB Created: 2021-06-23 20:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bdf2fd18061d3c4c1949eb4b5bb9b32a SHA-1: 162af16053a890892b4e9a64b3b1e718d5ded4ad SHA-256: 9d41a59eb05e5538e950991ed0cdaf39c182db0838782d0ff34716717b0cfb21
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malware. The embedded URLs and the document's structure point towards a phishing or malware distribution scheme, likely masquerading as a software download to trick users into executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=free+download+foxit+phantom+pdf+editor PDF link annotation
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8447f3750172a5e04fddff6846d681c9/9119806280.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/72740348334.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9d18f6df---zazugifemo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ac4ec53d---mukewukedivin.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/15634273946.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/dobemodafivejifiso.pdfIn PDF document text
    • https://adikketiga.com/contents//files/jiselewok.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb669db9b43---xadanipudilegonaxomijudi.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/nivuxoketisudofowukataja.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/tq0ntuc9ad1kol941n203pbsbv/gitukenidegakawumumibubok.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be92f26f654---87072420329.pdfPDF link annotation
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a068be6f4c7---50370870725.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/klcsi5k8n09273i5dtqcsk5n2r/91682602036.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3600c0c90---figotopudetisogor.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zesotamutat.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/wabezemaxinixawezanepepib.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/1285038493.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 5220 bytes
SHA-256: 17bcdec79bd894dcefce1401e2489581a2faa473aec905c06ad1811678266faa
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 11188 bytes
SHA-256: 9263e293887cf8d20849d17be2f000afaf58afb0f9dd783b52d29610d1805d2d

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